Implement bpo-16055: Fixes incorrect error text for int('1', base=1000)

Merged Bitbucket Importer requested to merge branch/bpo-16055 into branch/default

Created originally on Bitbucket by Yannick_Jadoul (Yannick Jadoul)

Very minor detail, but I noticed when investigating another issue.

See https://bugs.python.org/issue16055 & https://github.com/python/cpython/pull/4376

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